Method of operating head-blocks of sawiito-mills



UNITE STS TE'I FFOE.

JOSEPH KURTZEMAN, OF LANCASTER, OHIO.

METHOD OF OPERATING HEAD-BLOCKS OF SAWING-MILLS.

Specification of Letters Patent No. 15,078, dated June 10, 1856.

To all whom may concern Be it known that I, J. KURTZEHAN, of Lancaster, in the county of Fairfield and State of Ohio, have invented a new and Improved Head-Block for Sawmill-Carriages; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the anneXed drawings, making a part of this specification, in which- Figure l, is a front view of my improvement. Fig. 2, is a transverse vertical section of ditto, (m) Fig. l, showing the plane of section. Fig. 3, is an inverted plan of ditto.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists in operating the dogs and head block from one and the same shaft, by means of gearing arranged as will be presentlyT shown and described, so that the head block may be adjusted to set the log properly to the saw, and the dogs also adjusted at the same time.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A, represents a saw mill carriage, and B, represents a head block placed transversely thereon.

C, C, are two dogs which are placed in the head block. These dogs are fitted in grooves in the block, and have racks (a) cut in their sides.

D, D, are small upright shafts fitted within the block, each shaft has a pinion E, upon it, and these pinions gear into the racks (a). The lower ends of the shafts D, D, have bevel wheels F, upon them, one at each end, and bevel pinions G, Gr, gear into the wheels F, said pinions being upon a shaft H, placed underneath the head block, and having a ratchet wheel I, on one end, into which ratchet a pawl J, catches, said pawl being attached to a lever K, which is placed loosely on the shaft H.

From the above description it will be seen that by operating the lever K, the pawl J, will actuate the ratchet I, and the dogs O, C, will be moved either forward or backward according to the direction in which the lever K, is moved.

L, is a shaft placed underneath the head block, and having a pinion M, on its inner end, which pinion gears into one of the bevel wheels F. The outer end of the shaft L, has a pawl N, attached to it.

O, is a toothed wheel placed loosely on the shaft L, and having a hollow hub or rim (b) attached to its inner side. This hub or rim is toothed on its inner periphery, and the pawl N, catches into the teeth of the hub or rim (b), see Fig. 2. The wheel O, gears into a rack P, which is attached to the flooring or some stationary part.

By moving the lever K, in one direction, the dogs C, C, will only be moved; but by moving it in the opposite direction, the head block B, will also be moved; the pawl N, catching against the teeth in the rim or hub (In) when the shaft L, is turned in one direction, and slipping over them when the shaft is turned in the opposite direction.

The above invention is extremely simple and efficient, and enables the log to be adjusted and set with the greatest facility.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is,

Connecting the dogs C, C, to the shaft H, by means of the racks (a) and gearing E, F, G, in combination with the toothed wheel O, having vthe hollow hub or geared rim (b) attached, the wheel being placed loosely on the shaft L, -which is provided with the pawl N, substantially as shown and described for the purpose specified.

JOSEPH KURTZEMAN. 

